using System;
using System.Runtime.InteropServices;

namespace MouseKeyboardActivityMonitor.WinApi
{
    internal static class ThreadNativeMethods
    {
        /// <summary>
        /// Retrieves the unmanaged thread identifier of the calling thread.
        /// </summary>
        /// <returns></returns>
        [DllImport("kernel32")]
        internal static extern int GetCurrentThreadId();

        /// <summary>
        /// Retrieves a handle to the foreground window (the window with which the user is currently working). 
        /// The system assigns a slightly higher priority to the thread that creates the foreground window than it does to other threads. 
        /// </summary>
        /// <returns></returns>
        [DllImport( "user32.dll", CharSet = CharSet.Auto )]
        internal static extern IntPtr GetForegroundWindow();

        /// <summary>
        /// Retrieves the identifier of the thread that created the specified window and, optionally, the identifier of the process that 
        /// created the window. 
        /// </summary>
        /// <param name="handle">A handle to the window. </param>
        /// <param name="processId">A pointer to a variable that receives the process identifier. If this parameter is not NULL, 
        ///                         GetWindowThreadProcessId copies the identifier of the process to the variable; otherwise, it does not. </param>
        /// <returns>The return value is the identifier of the thread that created the window. </returns>
        [DllImport( "user32.dll", CharSet = CharSet.Auto, SetLastError = true )]
        internal static extern int GetWindowThreadProcessId( IntPtr handle, out int processId );
    }
}